From IBIKE.ORG

More Than Forty Good Reasons For Bicycling

1. Bicycles Increase Mobility For Those Who Don't Have Access To Motor Transport.
2. Bikes Increase Mobility For Those Who Don't Qualify To Drive A Car.
3. Bicycles Increase Mobility For Those Who Can't Afford Motor Transport.
4. Bikes Increase Mobility For Those Who Don't Want To Drive Motor Vehicles.
5. There Are 28 Miles Of Bike Trails In The City of Seattle.
6. Bicycling Is The Most Efficient Form Of Transportation Ever Invented.
7. You Get Exercise Form Bicycling
8. Save Travel Money By Biking
9. Reduce Stress
10. Biking Is Therapeutic For The Mind & Spirit
11. Cycling Is Therapeutic For The Body
12. Your Commute Will Be The Best Part Of Your Day Instead Of The Worst Part Of Your Day.
13. Cycling Improves Self-Esteem
14. Save On The Membership To A Health Club, Get Your Exercise Bicycling To Work
15. Cycling Is Low Impact On The Body
16. Cycling Is Low Impact On The Environment
17. Bicycling In Your Neighborhood Is A Great Way To Meet Your Neighbors
18. Camaraderie of Cyclists Makes It A Great Way To Meet A Nice Stranger With A Similar Interest
19. Bicyclist Can Ignore the Traffic Reports
20. Feel the Self-satisfaction Of Biking Past A Traffic Jam In The Bike Lane.
21. Predictable Commute Time
22. Easier Parking
23. Cheaper Parking
24. Leaving Your Car At Home Provide A Parking Space For Someone Less Fortunate
25. If You Are Lazy, Your Bicycle Provides Door-To-Door Transport (You Don't Have To Walk Across A Vast Parking Lot)
26. Reduce Demand For Parking Lots
27. Reduce Energy Consumption (see below)
28. Reduce Air Pollution -- Bicyclist Emit Few Gases
29. Reduce Water Pollution -- Bikes Don't Drip Brake Fluid, Anti-Freeze, Transmission Fluid, Etc.
30. Reduce Noise Pollution -- Even Without A Muffler Bikes Are Quiet
31. Reduces Road Wear -- Even If Cyclist Feel Like They Have The Weight Of The World On Their Shoulders.
32. A four mile bicycle trip keeps about 15 pounds of pollutants out of the air we breathe.
33. 40% Of All Trips In The U.S. Are Within Two Miles Of Home.
34. Prevent and protest the sanctioned murder of responsible citizens.
35. Bikes Small Profile Reduce Congestion
36. Motor Vehicle Emissions Cause More Than Half Of The Northwest's Air Pollution.
37. Reduce Need To Lay Additional Asphalt And Concrete
38. Easier to Vary Your Route By Bicycle
39. Bicycling Improves Cardio-Vascular Health
40. Better muscle tone, bone mass improvement, clearer skin
41. Healthier People Have Lower Health Care Expenses
42. New bicycle commuters can expect to lose 13 pounds their first year of bicycle commuting.
43. The Exercise Increase Your Productivity At Work
44. Increased Bike Uses Generates Bike Facilities Which Increase Property Values
45. Bicycling Gives You More Fresh Air Than A Sauna And You Can Still Sweat And Clean Your Pores
46. Bike Commuting Is A License To Dress Weird And Still Feel Smug
47. Urban Cycling Keeps You Humble
48. Biking Is Virtually Life Long Activity
49. Bicycling Can Be Enjoyed In A Wide Variety Of Topography
50. Cycling Can Be Enjoyed In A Wide Variety Of Climates
51. Bicycles Are A Great Means To See The World
52. Bicycling is cool.
53. Biking Is Fun.